Mott-Schottky plots frequency dispersion

Even if the depletion layer contribution can be successfully separated from the other contributiOTis in the system, one may find that it does not behave as an ideal capacitor. A clear indication of this is the observation of frequency dispersion in the Mott-Schottky plot, or a somewhat depressed semicircle instead of a perfectly round one in a Nyquist plot of the impedance spectrum. In such cases, it is often... 

---